I'm using Outlook 2007 SP2 on XP SP3 and I'm connecting to an SBS 2008 Server that is running Exchange 2007.
I occasionally get popups in Outlook asking me to enter my domain credentials so that Outlook can connect to the server. I'm logged into a domain user account and I'm on the LAN where the server resides. I can access other network resources with no problem including all network drives (they don't show disconnected either).
Most of the time Outlook works fine without popping up and asking for credentials.
When I do type in my username and password it doesn't seem to satisfy Outlook. Outlook continues to ask for more passwords and also pops up windows asking about certain certificates.
What could be causing this problem? How do I troubleshoot it?